Refrigerator



FIG. 1 is a perspective view of a refrigerator, showing our design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is another side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines illustrating portions of the refrigerator form no part of the claimed design. 

CLAIM The ornamental design for a refrigerator, as shown and described. 